Nice illustration. Most tests are as simple as those you have shown. Tests are meant to be very simple. Test the value of a function, test the type of the class prodcued by your constructor, test that your function breaks nicely for stupid inputs - by feeding it stupid inputs and looking at the results.

Take a look at some of the test code on CPAN - the few that I've looked at consist of strings of simple tests. The hardest tests are those which depend on something outside your module.

When putting a smiley right before a closing parenthesis, do you:

Use two parentheses: (Like this: :) )
Use one parenthesis: (Like this: :)
Reverse direction of the smiley: (Like this: (: )
Use angle/square brackets instead of parentheses
Use C-style commenting to set the smiley off from the closing parenthesis
Make the smiley a dunce: (:>
I disapprove of emoticons
Other